| Loess has strong structural,water-sensitive,vertical joint development characteristics.Cracks,rainfall and earthquakes are the main influencing factors of loess landslides.In this paper,the effects of earthquakes,rainfall and damaged belts on the safety and stability of slopes are studied.The following research work is carried out:(1)By reviewing relevant literatures,the main methods of slope stability analysis are summarized.The failure modes of loess slopes and their causes of instability are summarized.The high slopes of the 98km edge channel of Baojixia are studied to study earthquakes,rainfall and slopes.The influence of the damage inside the body on the stability of the loess slope.(2)The damage zone is set at different heights in the two-dimensional slope,and the variation characteristics of the safety factor of the slope are analyzed:The evolution law of the progressive failure of the slope at different heights of the slope is studied,and the damage location to the landslide is discussed.The sensitivity of the instability effect summarizes the different development patterns of the slope slip zone when the damage zone is at different positions.(3)Establishing a three-dimensional geo logical model,comparing the dynamic response results of different incident angles of seismic waves with phase difference between horizontal and vertical directions,and analyzing the variation of acceleration and displacement of different monitoring points on slopes.The variation characteristics of safety factor and minimum average safety factor when the horizontal and vertical seismic waves are out of phase are studied.The influence of the phase difference between horizontal and vertical seismic waves on the safety and stability of the slope is summarized.(4)According to the two historical rainfall schedules,the method of designing rainfall with the same ratio to enlarge the rainfall intensity is used to design the rain time history function of different frequencies,and the influence characteristics of different rainfall frequencies and rainfall types on slope stability are compared and analyzed.The main influencing factors of the instability of the slope during a heavy rainfall.Through the analysis of the stability of the slope under the damaged zone,earthquake and rainfall conditions,the safety law of the slope under different conditions and the evolution law of the slope failure are obtained,which provides the early warning of the landslide and the treatment of the slope.Theoretical guidance. |
